We have put online a size chart for most of our products on our website. It is more or less reliable of 5% because it will depend on your morphology and your preferences. You can take a piece of sports equipment that you usually wear, put it on a table and take the measurements as shown on our website. If you wish to have correct measurements, please install the relevant equipment that is similar to the one you wish to order from SAVI, directly on a flat surface without making someone wear them.